rails-api & rails 4 not working with rack-cors? · Issue #33 · cyu/rack-cors · GitHub
The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. · Issue #624 · rails/webpacker · GitHub
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ruby on rails - No 'Access-Control-Allow-Origin' header is present on the requested resource. Google Font - Stack Overflow
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